Demographics and Baseline Characteristics of the iDEAL Study: A Randomized, Multi-center, Phase II Study of the safety, Tolerability, and Bioactivity of Repeated Intravitreal Injections of iCO-007 as Monotherapy or in Combination with Ranibizumab or Laser Photocoagulation in the Treatment of Diabetic Macular Edema with Involvement of the FoveAL Center